I. Basic Information

Product Positioning

Hardware Architecture

1. Isolated VCO Shunt Signal Frequency Conversion Unit: Converts ±500mV weak analog shunt signals into 0~500kHz differential frequency outputs through floating DC isolation circuits, effectively suppressing strong electromagnetic interference in high-voltage rectifier cabinets to guarantee stable current sampling for excitation closed-loop control.
2. Configurable Voltage & Current Attenuation Conditioning Unit: 17 groups of hardware jumpers support 10:1 CT attenuation or bypass mode, adapting to two voltage ranges of 240~600VAC and 601~1000VAC to realize safe step-down of high-voltage field signals.
3. Multi-channel High-voltage Signal Acquisition Interface Unit: Equipped with 6×2-pin and 2×4-pin connectors, integrated RC & MOV surge absorption circuits to clamp switching overvoltage generated by SCR rectifiers and protect internal precision sampling circuits.
4. Dual Galvanic Isolation Safety Protection Unit: Optical + RC isolation is adopted between high-voltage power side and low-voltage control side to block ground loop interference and common-mode high-voltage backfeed, ensuring long-term drift-free signal transmission.
5. Rugged VME Rack Mount Structure: Four-hole fixed installation design with conformal coated PCB, built-in high-capacity filter components, excellent heat dissipation, shock and dust resistance for long-term stable operation in closed high-temperature control cabinets.

Mounting Specifications

• Operating Power Supply: 24VDC from VME rack backplane
• Shunt Input Range: -500mV ~ +500mV
• Frequency Output Range: 0 ~ 500kHz Differential Signal
• Adaptable AC Voltage: 240VAC ~ 1000VAC
• Current Attenuation: 10:1 CT or bypass selectable via jumpers
• On-board Configuration: 17 configurable jumpers, 6×2-pin, 2×4-pin connectors
• Mounting: Standard VME rack 4-screw fixed installation
• Dimension: 241mm × 178mm × 38mm
• Net Weight: 1.36kg
• Protection Class: IP20 (indoor high-voltage cabinet installation only)
• Supporting Equipment: SDCI/DCFB/PCCA control boards, SCR rectifier bridge, precision shunts, shielded high-voltage signal cables
• Commissioning Tools: Mark V configuration software, mV signal calibrator, frequency tester, insulation resistance tester, anti-static wristband

Supporting System

Supporting Hardware

Commissioning Software

Upper-level System

Typical Application Industries

Product Features

1. High Anti-interference Precision Sampling via Analog-to-Frequency Conversion: Differential frequency transmission eliminates EMI interference in high-voltage rectifier cabinets, avoiding excitation oscillation and unit load fluctuation caused by signal drift.
2. Wide Voltage Range Adaptation via 17 Groups of Configurable Jumpers: Two attenuation modes cover 240~1000V working conditions, reducing enterprise spare part inventory types.
3. Multi-stage Surge & Galvanic Isolation Protection: MOV, RC and optical isolation layers prevent high-voltage backfeed damage to main control hardware, improving overall system safety.
4. Integrated Front-end Signal Conditioning for SCR Rectifier Systems: Centralizes high-voltage signal step-down, isolation and conversion functions to simplify cabinet wiring and reduce circuit failure points.
5. Industrial Conformal Coating Rugged Design: Operates stably from -25℃ to +70℃ in compliance with IEC EMC standards, supporting 24/7 continuous high-reliability operation.
6. Plug-and-play VME Compatible Replacement: Identical mechanical dimension, backplane protocol and terminal definition enable direct in-situ replacement by fully copying original jumper settings to minimize unit maintenance downtime.

II. Technical Specifications

2.1 Electrical Parameters

• Model: DS200SHVMG1A
• Backplane Supply: 24VDC, typical power ≤13W
• Analog Shunt Input: -500mV ~ +500mV, accuracy ±0.1%FS
• Differential Frequency Output: 0~500kHz, linear error ≤0.05%
• Voltage Application Range: 240~600VAC (bypass), 601~1000VAC (10:1 attenuation)
• Dielectric Withstand Voltage: 2000VAC/1min between high-voltage and control isolated loops
• Built-in Protection: Reverse polarity, overvoltage, ESD, surge absorption, input short-circuit latch protection
• Core Functions: High-voltage signal attenuation, shunt signal VCO frequency conversion, galvanic isolated rectifier loop data acquisition, hardware range configuration via jumpers

2.2 Mechanical Parameters

• Mounting: Standard VME rack four-corner screw locking installation
• Structure: Flame-retardant multilayer PCB, metal reinforced front panel, on-board status indicators and high-voltage filter components
• Interfaces: 17 jumper terminals, 6×2-pin, 2×4-pin connectors
• Dimension: 241 × 178 × 38mm
• Net Weight: 1.36kg

2.3 Environmental Specifications

• Operating Temperature: -25℃ ~ +70℃
• Storage Temperature: -40℃ ~ +85℃
• Humidity: 5%~95%RH, non-condensing, no corrosive gas or conductive dust

III. Key Features

1. High-precision Isolated Sampling of Rectifier Shunt Current: Converts DC shunt tiny voltage signals into stable frequency feedback for generator excitation and DC motor closed-loop voltage regulation to stabilize unit active and reactive power output.
2. Range-adaptive High-voltage Signal Step-down Acquisition: Matches field AC/DC high-voltage levels via hardware jumpers to convert dangerous high-voltage signals into safe low-range measurable signals for full online monitoring of rectifier system operating status.
3. Galvanic Isolation Barrier Between High-power and Low-voltage Control Loops: Effectively prevents bulk main control hardware damage caused by field grounding short-circuit and induced high-voltage backfeed faults.
4. Fast On-site Hardware Configuration via 17 Jumpers: One-to-one replication of original jumper positions ensures seamless spare replacement without system range recalibration, greatly shortening commissioning period and parameter misconfiguration risks.
5. Preventive Early Warning of Rectifier Hidden Faults: Identifies abnormal conditions such as overvoltage and signal open-circuit via frequency deviation to realize predictive maintenance of excitation and drive equipment.
6. Standard Front-end Matching Component for EX2000 Excitation & M-frame DC Drive Systems: Widely used in new unit commissioning, old cabinet overhaul and control system safety upgrading of heavy industrial power plants.

IV. Working Principle

V. Application Scenarios

1. SCR rectifier system maintenance, spare part replacement and sampling loop calibration for EX2000 generator excitation cabinets in combined-cycle thermal power plants.
2. Technical renovation and anti-interference upgrading of M-frame DC compressor drive control systems in petrochemical and natural gas stations.
3. Intelligent transformation of old generator excitation systems for steel and waste heat power plants to eliminate sampling drift and excitation oscillation faults.
4. Preventive spare part reserve and annual high-voltage loop insulation inspection for heavy-duty industrial DC drive equipment.
5. Hardware optimization upgrading of cogeneration turbine control systems to simplify high-voltage signal acquisition layout and reduce loop failure rates.